Great execution does not a front page make.
The is an outstanding execution of a totally unorginal idea, with little to no innovation apparent. It seems very well programmed, but that alone doesn't make me want to play it. (I gave it a 4 anyway, just because I am a sucker for slick construction.)
Some suggestions:
1. Make the up & down arrows the same size as the left and right ones. The change in size is jarring.
2. The flavor text? No one has time to read it. If you want to make it more fun- and more distracting- print the messages on the arrows themselves. Put something funny on them, and the game could actually be enjoyable for short bursts.
3. There didn't seem to be an end to the game, and I lost interest pretty fast. Make it possible to quit by hitting the esc key, rather than having to watch 15 arrows die first.
You are certainly very good with flash; you just need some better ideas.